Some U.S. founding documents are nearly 250 years old, so how do they withstand the test of time? A combination of chemicals, technology and a steady hand help preserve pieces like the Constitution. The National Archives and Records Administration has been responsible for the care of these documents since 1934. Here is a look at what it takes to keep these national Video by: Jared Soares | @All Purpose #unitedstates #howitsdone #documents